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Share-Based Compensation - Additional Information (Details)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Employee Stock Purchase Plan [Member]	Jun. 30, 2011 Employee Stock Purchase Plan [Member]	May 04, 2012 Stock Option Plan 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for option grants					3,000,000
Options granted	2,822,990	2,998,390
Issuance of shares under stock purchase plan			0	0

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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